Mercurial > hg > nginx-quic
annotate src/core/ngx_resolver.c @ 4454:bd1a95dd6dd3 stable-1.0 release-1.0.12
nginx-1.0.12-RELEASE
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 06 Feb 2012 14:08:59 +0000 |
parents | 4919fb357a5d |
children | 79142134d616 |
rev | line source |
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583 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
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4 * Copyright (C) Nginx, Inc. |
583 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_event.h> | |
11 | |
12 | |
1649 | 13 #define NGX_RESOLVER_UDP_SIZE 4096 |
14 | |
15 | |
583 | 16 typedef struct { |
1649 | 17 u_char ident_hi; |
18 u_char ident_lo; | |
19 u_char flags_hi; | |
20 u_char flags_lo; | |
21 u_char nqs_hi; | |
22 u_char nqs_lo; | |
23 u_char nan_hi; | |
24 u_char nan_lo; | |
25 u_char nns_hi; | |
26 u_char nns_lo; | |
27 u_char nar_hi; | |
28 u_char nar_lo; | |
29 } ngx_resolver_query_t; | |
30 | |
31 | |
32 typedef struct { | |
33 u_char type_hi; | |
34 u_char type_lo; | |
35 u_char class_hi; | |
36 u_char class_lo; | |
37 } ngx_resolver_qs_t; | |
38 | |
39 | |
40 typedef struct { | |
41 u_char type_hi; | |
42 u_char type_lo; | |
43 u_char class_hi; | |
44 u_char class_lo; | |
45 u_char ttl[4]; | |
46 u_char len_hi; | |
47 u_char len_lo; | |
48 } ngx_resolver_an_t; | |
49 | |
50 | |
51 ngx_int_t ngx_udp_connect(ngx_udp_connection_t *uc); | |
52 | |
53 | |
1906 | 54 static void ngx_resolver_cleanup(void *data); |
55 static void ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree); | |
1649 | 56 static ngx_int_t ngx_resolve_name_locked(ngx_resolver_t *r, |
57 ngx_resolver_ctx_t *ctx); | |
58 static void ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
59 ngx_queue_t *queue); | |
60 static ngx_int_t ngx_resolver_send_query(ngx_resolver_t *r, | |
61 ngx_resolver_node_t *rn); | |
62 static ngx_int_t ngx_resolver_create_name_query(ngx_resolver_node_t *rn, | |
63 ngx_resolver_ctx_t *ctx); | |
64 static ngx_int_t ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, | |
65 ngx_resolver_ctx_t *ctx); | |
66 static void ngx_resolver_resend_handler(ngx_event_t *ev); | |
67 static time_t ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, | |
68 ngx_queue_t *queue); | |
69 static void ngx_resolver_read_response(ngx_event_t *rev); | |
70 static void ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, | |
71 size_t n); | |
72 static void ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t n, | |
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73 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans); |
1649 | 74 static void ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, |
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75 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan); |
1649 | 76 static ngx_resolver_node_t *ngx_resolver_lookup_name(ngx_resolver_t *r, |
77 ngx_str_t *name, uint32_t hash); | |
78 static ngx_resolver_node_t *ngx_resolver_lookup_addr(ngx_resolver_t *r, | |
79 in_addr_t addr); | |
80 static void ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
81 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); | |
82 static ngx_int_t ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, | |
83 u_char *buf, u_char *src, u_char *last); | |
84 static void ngx_resolver_timeout_handler(ngx_event_t *ev); | |
85 static void ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn); | |
86 static void *ngx_resolver_alloc(ngx_resolver_t *r, size_t size); | |
1903 | 87 static void *ngx_resolver_calloc(ngx_resolver_t *r, size_t size); |
1649 | 88 static void ngx_resolver_free(ngx_resolver_t *r, void *p); |
89 static void ngx_resolver_free_locked(ngx_resolver_t *r, void *p); | |
90 static void *ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size); | |
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91 static u_char *ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len); |
1649 | 92 |
93 | |
94 ngx_resolver_t * | |
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95 ngx_resolver_create(ngx_conf_t *cf, ngx_addr_t *addr) |
1649 | 96 { |
97 ngx_resolver_t *r; | |
1906 | 98 ngx_pool_cleanup_t *cln; |
1649 | 99 ngx_udp_connection_t *uc; |
100 | |
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101 cln = ngx_pool_cleanup_add(cf->pool, 0); |
1906 | 102 if (cln == NULL) { |
103 return NULL; | |
104 } | |
105 | |
106 cln->handler = ngx_resolver_cleanup; | |
107 | |
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108 r = ngx_calloc(sizeof(ngx_resolver_t), cf->log); |
1649 | 109 if (r == NULL) { |
110 return NULL; | |
111 } | |
112 | |
1906 | 113 cln->data = r; |
114 | |
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115 r->event = ngx_calloc(sizeof(ngx_event_t), cf->log); |
1649 | 116 if (r->event == NULL) { |
117 return NULL; | |
118 } | |
119 | |
1687 | 120 ngx_rbtree_init(&r->name_rbtree, &r->name_sentinel, |
121 ngx_resolver_rbtree_insert_value); | |
122 | |
123 ngx_rbtree_init(&r->addr_rbtree, &r->addr_sentinel, | |
124 ngx_rbtree_insert_value); | |
1649 | 125 |
1685 | 126 ngx_queue_init(&r->name_resend_queue); |
127 ngx_queue_init(&r->addr_resend_queue); | |
128 | |
129 ngx_queue_init(&r->name_expire_queue); | |
130 ngx_queue_init(&r->addr_expire_queue); | |
1649 | 131 |
132 r->event->handler = ngx_resolver_resend_handler; | |
133 r->event->data = r; | |
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134 r->event->log = &cf->cycle->new_log; |
1649 | 135 r->ident = -1; |
136 | |
137 r->resend_timeout = 5; | |
138 r->expire = 30; | |
139 r->valid = 300; | |
140 | |
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141 r->log = &cf->cycle->new_log; |
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142 r->log_level = NGX_LOG_ERR; |
1649 | 143 |
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144 if (addr) { |
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145 uc = ngx_calloc(sizeof(ngx_udp_connection_t), cf->log); |
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146 if (uc == NULL) { |
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147 return NULL; |
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148 } |
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149 |
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150 r->udp_connection = uc; |
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151 |
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152 uc->sockaddr = addr->sockaddr; |
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153 uc->socklen = addr->socklen; |
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154 uc->server = addr->name; |
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155 |
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156 uc->log = cf->cycle->new_log; |
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157 uc->log.handler = ngx_resolver_log_error; |
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158 uc->log.data = uc; |
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159 uc->log.action = "resolving"; |
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160 } |
1649 | 161 |
162 return r; | |
163 } | |
164 | |
165 | |
1906 | 166 static void |
167 ngx_resolver_cleanup(void *data) | |
168 { | |
169 ngx_resolver_t *r = data; | |
170 | |
171 if (r) { | |
172 ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0, | |
173 "cleanup resolver"); | |
174 | |
175 ngx_resolver_cleanup_tree(r, &r->name_rbtree); | |
176 | |
177 ngx_resolver_cleanup_tree(r, &r->addr_rbtree); | |
178 | |
179 if (r->event) { | |
180 ngx_free(r->event); | |
181 } | |
182 | |
183 if (r->udp_connection) { | |
184 if (r->udp_connection->connection) { | |
185 ngx_close_connection(r->udp_connection->connection); | |
186 } | |
187 | |
188 ngx_free(r->udp_connection); | |
189 } | |
190 | |
191 ngx_free(r); | |
192 } | |
193 } | |
194 | |
195 | |
196 static void | |
197 ngx_resolver_cleanup_tree(ngx_resolver_t *r, ngx_rbtree_t *tree) | |
198 { | |
199 ngx_resolver_ctx_t *ctx, *next; | |
200 ngx_resolver_node_t *rn; | |
201 | |
202 while (tree->root != tree->sentinel) { | |
203 | |
204 rn = (ngx_resolver_node_t *) ngx_rbtree_min(tree->root, tree->sentinel); | |
205 | |
206 ngx_queue_remove(&rn->queue); | |
207 | |
208 for (ctx = rn->waiting; ctx; ctx = next) { | |
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209 next = ctx->next; |
1906 | 210 |
211 if (ctx->event) { | |
212 ngx_resolver_free(r, ctx->event); | |
213 } | |
214 | |
215 ngx_resolver_free(r, ctx); | |
216 } | |
217 | |
218 ngx_rbtree_delete(tree, &rn->node); | |
219 | |
220 ngx_resolver_free_node(r, rn); | |
221 } | |
222 } | |
223 | |
224 | |
1649 | 225 ngx_resolver_ctx_t * |
226 ngx_resolve_start(ngx_resolver_t *r, ngx_resolver_ctx_t *temp) | |
227 { | |
228 in_addr_t addr; | |
229 ngx_resolver_ctx_t *ctx; | |
230 | |
231 if (temp) { | |
232 addr = ngx_inet_addr(temp->name.data, temp->name.len); | |
233 | |
234 if (addr != INADDR_NONE) { | |
235 temp->resolver = r; | |
236 temp->state = NGX_OK; | |
237 temp->naddrs = 1; | |
238 temp->addrs = &temp->addr; | |
239 temp->addr = addr; | |
240 temp->quick = 1; | |
241 | |
242 return temp; | |
243 } | |
244 } | |
245 | |
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246 if (r->udp_connection == NULL) { |
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247 return NGX_NO_RESOLVER; |
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248 } |
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249 |
1649 | 250 ctx = ngx_resolver_calloc(r, sizeof(ngx_resolver_ctx_t)); |
251 | |
252 if (ctx) { | |
253 ctx->resolver = r; | |
254 } | |
255 | |
256 return ctx; | |
257 } | |
258 | |
259 | |
260 ngx_int_t | |
261 ngx_resolve_name(ngx_resolver_ctx_t *ctx) | |
262 { | |
263 ngx_int_t rc; | |
264 ngx_resolver_t *r; | |
265 | |
266 r = ctx->resolver; | |
267 | |
268 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
269 "resolve: \"%V\"", &ctx->name); | |
270 | |
271 if (ctx->quick) { | |
272 ctx->handler(ctx); | |
273 return NGX_OK; | |
274 } | |
275 | |
276 /* lock name mutex */ | |
277 | |
278 rc = ngx_resolve_name_locked(r, ctx); | |
279 | |
280 if (rc == NGX_OK) { | |
281 return NGX_OK; | |
282 } | |
283 | |
284 /* unlock name mutex */ | |
285 | |
286 if (rc == NGX_AGAIN) { | |
287 return NGX_OK; | |
288 } | |
289 | |
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290 /* NGX_ERROR */ |
1649 | 291 |
292 if (ctx->event) { | |
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293 ngx_resolver_free(r, ctx->event); |
1649 | 294 } |
295 | |
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296 ngx_resolver_free(r, ctx); |
1649 | 297 |
298 return NGX_ERROR; | |
299 } | |
300 | |
301 | |
302 void | |
303 ngx_resolve_name_done(ngx_resolver_ctx_t *ctx) | |
304 { | |
305 uint32_t hash; | |
306 ngx_resolver_t *r; | |
307 ngx_resolver_ctx_t *w, **p; | |
308 ngx_resolver_node_t *rn; | |
309 | |
310 r = ctx->resolver; | |
311 | |
312 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
313 "resolve name done: %i", ctx->state); | |
314 | |
315 if (ctx->quick) { | |
316 return; | |
317 } | |
318 | |
319 if (ctx->event && ctx->event->timer_set) { | |
320 ngx_del_timer(ctx->event); | |
321 } | |
322 | |
323 /* lock name mutex */ | |
324 | |
325 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
326 | |
327 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
328 | |
329 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
330 | |
331 if (rn) { | |
332 p = &rn->waiting; | |
333 w = rn->waiting; | |
334 | |
335 while (w) { | |
336 if (w == ctx) { | |
337 *p = w->next; | |
338 | |
339 goto done; | |
340 } | |
341 | |
342 p = &w->next; | |
343 w = w->next; | |
344 } | |
345 } | |
346 | |
347 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
348 "could not cancel %V resolving", &ctx->name); | |
349 } | |
350 | |
351 done: | |
352 | |
353 ngx_resolver_expire(r, &r->name_rbtree, &r->name_expire_queue); | |
354 | |
355 /* unlock name mutex */ | |
356 | |
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357 /* lock alloc mutex */ |
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358 |
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359 if (ctx->event) { |
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360 ngx_resolver_free_locked(r, ctx->event); |
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361 } |
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362 |
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363 ngx_resolver_free_locked(r, ctx); |
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364 |
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365 /* unlock alloc mutex */ |
1649 | 366 } |
367 | |
368 | |
369 /* NGX_RESOLVE_A only */ | |
370 | |
371 static ngx_int_t | |
372 ngx_resolve_name_locked(ngx_resolver_t *r, ngx_resolver_ctx_t *ctx) | |
373 { | |
374 uint32_t hash; | |
375 in_addr_t addr, *addrs; | |
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376 ngx_int_t rc; |
1649 | 377 ngx_uint_t naddrs; |
378 ngx_resolver_ctx_t *next; | |
379 ngx_resolver_node_t *rn; | |
380 | |
381 hash = ngx_crc32_short(ctx->name.data, ctx->name.len); | |
382 | |
383 rn = ngx_resolver_lookup_name(r, &ctx->name, hash); | |
384 | |
385 if (rn) { | |
386 | |
387 if (rn->valid >= ngx_time()) { | |
388 | |
389 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
390 | |
391 ngx_queue_remove(&rn->queue); | |
392 | |
393 rn->expire = ngx_time() + r->expire; | |
394 | |
395 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
396 | |
397 naddrs = rn->naddrs; | |
398 | |
399 if (naddrs) { | |
400 | |
401 /* NGX_RESOLVE_A answer */ | |
402 | |
403 if (naddrs != 1) { | |
404 addr = 0; | |
405 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
406 naddrs * sizeof(in_addr_t)); | |
407 if (addrs == NULL) { | |
408 return NGX_ERROR; | |
409 } | |
410 | |
411 } else { | |
412 addr = rn->u.addr; | |
413 addrs = NULL; | |
414 } | |
415 | |
416 ctx->next = rn->waiting; | |
417 rn->waiting = NULL; | |
418 | |
419 /* unlock name mutex */ | |
420 | |
421 do { | |
422 ctx->state = NGX_OK; | |
423 ctx->naddrs = naddrs; | |
424 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
425 ctx->addr = addr; | |
426 next = ctx->next; | |
427 | |
428 ctx->handler(ctx); | |
429 | |
430 ctx = next; | |
431 } while (ctx); | |
432 | |
433 if (addrs) { | |
434 ngx_resolver_free(r, addrs); | |
435 } | |
436 | |
437 return NGX_OK; | |
438 } | |
439 | |
440 /* NGX_RESOLVE_CNAME */ | |
441 | |
1969 | 442 if (ctx->recursion++ < NGX_RESOLVER_MAX_RECURSION) { |
443 | |
444 ctx->name.len = rn->cnlen; | |
445 ctx->name.data = rn->u.cname; | |
446 | |
447 return ngx_resolve_name_locked(r, ctx); | |
448 } | |
449 | |
450 ctx->next = rn->waiting; | |
451 rn->waiting = NULL; | |
452 | |
453 /* unlock name mutex */ | |
454 | |
455 do { | |
456 ctx->state = NGX_RESOLVE_NXDOMAIN; | |
457 next = ctx->next; | |
458 | |
459 ctx->handler(ctx); | |
460 | |
461 ctx = next; | |
462 } while (ctx); | |
463 | |
464 return NGX_OK; | |
1649 | 465 } |
466 | |
467 if (rn->waiting) { | |
468 | |
469 ctx->next = rn->waiting; | |
470 rn->waiting = ctx; | |
3297 | 471 ctx->state = NGX_AGAIN; |
1649 | 472 |
473 return NGX_AGAIN; | |
474 } | |
475 | |
476 ngx_queue_remove(&rn->queue); | |
477 | |
478 /* lock alloc mutex */ | |
479 | |
480 ngx_resolver_free_locked(r, rn->query); | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
481 rn->query = NULL; |
1649 | 482 |
483 if (rn->cnlen) { | |
484 ngx_resolver_free_locked(r, rn->u.cname); | |
485 } | |
486 | |
487 if (rn->naddrs > 1) { | |
488 ngx_resolver_free_locked(r, rn->u.addrs); | |
489 } | |
490 | |
491 /* unlock alloc mutex */ | |
492 | |
493 } else { | |
494 | |
495 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
496 if (rn == NULL) { | |
497 return NGX_ERROR; | |
498 } | |
499 | |
500 rn->name = ngx_resolver_dup(r, ctx->name.data, ctx->name.len); | |
501 if (rn->name == NULL) { | |
502 ngx_resolver_free(r, rn); | |
503 return NGX_ERROR; | |
504 } | |
505 | |
506 rn->node.key = hash; | |
507 rn->nlen = (u_short) ctx->name.len; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
508 rn->query = NULL; |
1649 | 509 |
510 ngx_rbtree_insert(&r->name_rbtree, &rn->node); | |
511 } | |
512 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
513 rc = ngx_resolver_create_name_query(rn, ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
514 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
515 if (rc == NGX_ERROR) { |
1649 | 516 goto failed; |
517 } | |
518 | |
1961
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
519 if (rc == NGX_DECLINED) { |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
520 ngx_rbtree_delete(&r->name_rbtree, &rn->node); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
521 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
522 ngx_resolver_free(r, rn->query); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
523 ngx_resolver_free(r, rn->name); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
524 ngx_resolver_free(r, rn); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
525 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
526 ctx->state = NGX_RESOLVE_NXDOMAIN; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
527 ctx->handler(ctx); |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
528 |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
529 return NGX_OK; |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
530 } |
99b9feacccb4
return NXDOMAIN for ".." in host name
Igor Sysoev <igor@sysoev.ru>
parents:
1960
diff
changeset
|
531 |
1649 | 532 if (ngx_resolver_send_query(r, rn) != NGX_OK) { |
533 goto failed; | |
534 } | |
535 | |
536 if (ctx->event == NULL) { | |
537 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
538 if (ctx->event == NULL) { | |
539 goto failed; | |
540 } | |
541 | |
542 ctx->event->handler = ngx_resolver_timeout_handler; | |
543 ctx->event->data = ctx; | |
544 ctx->event->log = r->log; | |
545 ctx->ident = -1; | |
546 | |
547 ngx_add_timer(ctx->event, ctx->timeout); | |
548 } | |
549 | |
550 if (ngx_queue_empty(&r->name_resend_queue)) { | |
551 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
552 } | |
553 | |
554 rn->expire = ngx_time() + r->resend_timeout; | |
555 | |
556 ngx_queue_insert_head(&r->name_resend_queue, &rn->queue); | |
557 | |
558 rn->cnlen = 0; | |
559 rn->naddrs = 0; | |
560 rn->valid = 0; | |
561 rn->waiting = ctx; | |
562 | |
563 ctx->state = NGX_AGAIN; | |
564 | |
565 return NGX_AGAIN; | |
566 | |
567 failed: | |
568 | |
569 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
570 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
571 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
572 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
573 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
574 |
1649 | 575 ngx_resolver_free(r, rn->name); |
576 | |
577 ngx_resolver_free(r, rn); | |
578 | |
579 return NGX_ERROR; | |
580 } | |
583 | 581 |
582 | |
583 ngx_int_t | |
1649 | 584 ngx_resolve_addr(ngx_resolver_ctx_t *ctx) |
585 { | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
586 u_char *name; |
1649 | 587 ngx_resolver_t *r; |
588 ngx_resolver_node_t *rn; | |
589 | |
590 r = ctx->resolver; | |
591 | |
592 ctx->addr = ntohl(ctx->addr); | |
593 | |
594 /* lock addr mutex */ | |
595 | |
596 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
597 | |
598 if (rn) { | |
599 | |
600 if (rn->valid >= ngx_time()) { | |
601 | |
602 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolve cached"); | |
603 | |
604 ngx_queue_remove(&rn->queue); | |
605 | |
606 rn->expire = ngx_time() + r->expire; | |
607 | |
608 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
609 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
610 name = ngx_resolver_dup(r, rn->name, rn->nlen); |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
611 if (name == NULL) { |
1649 | 612 goto failed; |
613 } | |
614 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
615 ctx->name.len = rn->nlen; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
616 ctx->name.data = name; |
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
617 |
1649 | 618 /* unlock addr mutex */ |
619 | |
620 ctx->state = NGX_OK; | |
621 | |
622 ctx->handler(ctx); | |
623 | |
2484
cf3cd450049c
store name pointer in variable allocated on stack
Igor Sysoev <igor@sysoev.ru>
parents:
2483
diff
changeset
|
624 ngx_resolver_free(r, name); |
1649 | 625 |
626 return NGX_OK; | |
627 } | |
628 | |
629 if (rn->waiting) { | |
630 | |
631 ctx->next = rn->waiting; | |
632 rn->waiting = ctx; | |
3297 | 633 ctx->state = NGX_AGAIN; |
1649 | 634 |
2487
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
635 /* unlock addr mutex */ |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
636 |
9b4dce95c744
fix return code, this fixes segfault when two or more
Igor Sysoev <igor@sysoev.ru>
parents:
2486
diff
changeset
|
637 return NGX_OK; |
1649 | 638 } |
639 | |
640 ngx_queue_remove(&rn->queue); | |
641 | |
642 ngx_resolver_free(r, rn->query); | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
643 rn->query = NULL; |
1649 | 644 |
645 } else { | |
646 rn = ngx_resolver_alloc(r, sizeof(ngx_resolver_node_t)); | |
647 if (rn == NULL) { | |
648 goto failed; | |
649 } | |
650 | |
651 rn->node.key = ctx->addr; | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
652 rn->query = NULL; |
1649 | 653 |
654 ngx_rbtree_insert(&r->addr_rbtree, &rn->node); | |
655 } | |
656 | |
657 if (ngx_resolver_create_addr_query(rn, ctx) != NGX_OK) { | |
658 goto failed; | |
659 } | |
660 | |
661 if (ngx_resolver_send_query(r, rn) != NGX_OK) { | |
662 goto failed; | |
663 } | |
664 | |
665 ctx->event = ngx_resolver_calloc(r, sizeof(ngx_event_t)); | |
666 if (ctx->event == NULL) { | |
667 goto failed; | |
668 } | |
669 | |
670 ctx->event->handler = ngx_resolver_timeout_handler; | |
671 ctx->event->data = ctx; | |
672 ctx->event->log = r->log; | |
673 ctx->ident = -1; | |
674 | |
675 ngx_add_timer(ctx->event, ctx->timeout); | |
676 | |
677 if (ngx_queue_empty(&r->addr_resend_queue)) { | |
678 ngx_add_timer(r->event, (ngx_msec_t) (r->resend_timeout * 1000)); | |
679 } | |
680 | |
681 rn->expire = ngx_time() + r->resend_timeout; | |
682 | |
683 ngx_queue_insert_head(&r->addr_resend_queue, &rn->queue); | |
684 | |
685 rn->cnlen = 0; | |
686 rn->naddrs = 0; | |
687 rn->name = NULL; | |
688 rn->nlen = 0; | |
689 rn->valid = 0; | |
690 rn->waiting = ctx; | |
691 | |
692 /* unlock addr mutex */ | |
693 | |
694 ctx->state = NGX_AGAIN; | |
695 | |
696 return NGX_OK; | |
697 | |
698 failed: | |
699 | |
700 if (rn) { | |
701 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
702 | |
1960
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
703 if (rn->query) { |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
704 ngx_resolver_free(r, rn->query); |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
705 } |
1609b3c3d604
fix memory leak on resolver query send failure
Igor Sysoev <igor@sysoev.ru>
parents:
1914
diff
changeset
|
706 |
1649 | 707 ngx_resolver_free(r, rn); |
708 } | |
709 | |
710 /* unlock addr mutex */ | |
711 | |
712 if (ctx->event) { | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
713 ngx_resolver_free(r, ctx->event); |
1649 | 714 } |
715 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
716 ngx_resolver_free(r, ctx); |
1649 | 717 |
718 return NGX_ERROR; | |
719 } | |
720 | |
721 | |
722 void | |
723 ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx) | |
724 { | |
725 in_addr_t addr; | |
726 ngx_resolver_t *r; | |
727 ngx_resolver_ctx_t *w, **p; | |
728 ngx_resolver_node_t *rn; | |
729 | |
730 r = ctx->resolver; | |
731 | |
732 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
733 "resolve addr done: %i", ctx->state); | |
734 | |
735 if (ctx->event && ctx->event->timer_set) { | |
736 ngx_del_timer(ctx->event); | |
737 } | |
738 | |
739 /* lock addr mutex */ | |
740 | |
741 if (ctx->state == NGX_AGAIN || ctx->state == NGX_RESOLVE_TIMEDOUT) { | |
742 | |
743 rn = ngx_resolver_lookup_addr(r, ctx->addr); | |
744 | |
745 if (rn) { | |
746 p = &rn->waiting; | |
747 w = rn->waiting; | |
748 | |
749 while (w) { | |
750 if (w == ctx) { | |
751 *p = w->next; | |
752 | |
753 goto done; | |
754 } | |
755 | |
756 p = &w->next; | |
757 w = w->next; | |
758 } | |
759 } | |
760 | |
761 addr = ntohl(ctx->addr); | |
762 | |
763 ngx_log_error(NGX_LOG_ALERT, r->log, 0, | |
764 "could not cancel %ud.%ud.%ud.%ud resolving", | |
765 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
766 (addr >> 8) & 0xff, addr & 0xff); | |
767 } | |
768 | |
769 done: | |
770 | |
771 ngx_resolver_expire(r, &r->addr_rbtree, &r->addr_expire_queue); | |
772 | |
773 /* unlock addr mutex */ | |
774 | |
1904
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
775 /* lock alloc mutex */ |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
776 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
777 if (ctx->event) { |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
778 ngx_resolver_free_locked(r, ctx->event); |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
779 } |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
780 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
781 ngx_resolver_free_locked(r, ctx); |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
782 |
538f06aa8118
fix memory leaks, use unlocked ngx_resolver_free() for seldom failed cases
Igor Sysoev <igor@sysoev.ru>
parents:
1903
diff
changeset
|
783 /* unlock alloc mutex */ |
1649 | 784 } |
785 | |
786 | |
787 static void | |
788 ngx_resolver_expire(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
789 { | |
790 time_t now; | |
791 ngx_uint_t i; | |
792 ngx_queue_t *q; | |
793 ngx_resolver_node_t *rn; | |
794 | |
795 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver expire"); | |
796 | |
797 now = ngx_time(); | |
798 | |
799 for (i = 0; i < 2; i++) { | |
800 if (ngx_queue_empty(queue)) { | |
801 return; | |
802 } | |
803 | |
804 q = ngx_queue_last(queue); | |
805 | |
806 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
807 | |
808 if (now <= rn->expire) { | |
809 return; | |
810 } | |
811 | |
1774 | 812 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, |
813 "resolver expire \"%*s\"", (size_t) rn->nlen, rn->name); | |
1649 | 814 |
815 ngx_queue_remove(q); | |
816 | |
817 ngx_rbtree_delete(tree, &rn->node); | |
818 | |
819 ngx_resolver_free_node(r, rn); | |
820 } | |
821 } | |
822 | |
823 | |
824 static ngx_int_t | |
825 ngx_resolver_send_query(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
826 { | |
827 ssize_t n; | |
828 ngx_udp_connection_t *uc; | |
829 | |
830 uc = r->udp_connection; | |
831 | |
832 if (uc->connection == NULL) { | |
833 if (ngx_udp_connect(uc) != NGX_OK) { | |
834 return NGX_ERROR; | |
835 } | |
836 | |
837 uc->connection->data = r; | |
838 uc->connection->read->handler = ngx_resolver_read_response; | |
1906 | 839 uc->connection->read->resolver = 1; |
1649 | 840 } |
841 | |
842 n = ngx_send(uc->connection, rn->query, rn->qlen); | |
843 | |
844 if (n == -1) { | |
845 return NGX_ERROR; | |
846 } | |
847 | |
848 if ((size_t) n != (size_t) rn->qlen) { | |
3408
71193a456616
add context to a resolver log
Igor Sysoev <igor@sysoev.ru>
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849 ngx_log_error(NGX_LOG_CRIT, &uc->log, 0, "send() incomplete"); |
1649 | 850 return NGX_ERROR; |
851 } | |
852 | |
853 return NGX_OK; | |
854 } | |
855 | |
856 | |
857 static void | |
858 ngx_resolver_resend_handler(ngx_event_t *ev) | |
859 { | |
860 time_t timer, atimer, ntimer; | |
861 ngx_resolver_t *r; | |
862 | |
863 r = ev->data; | |
864 | |
865 ngx_log_debug0(NGX_LOG_DEBUG_CORE, r->log, 0, | |
866 "resolver resend handler"); | |
867 | |
868 /* lock name mutex */ | |
869 | |
870 ntimer = ngx_resolver_resend(r, &r->name_rbtree, &r->name_resend_queue); | |
871 | |
872 /* unlock name mutex */ | |
873 | |
874 /* lock addr mutex */ | |
875 | |
876 atimer = ngx_resolver_resend(r, &r->addr_rbtree, &r->addr_resend_queue); | |
1679
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diff
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877 |
1649 | 878 /* unlock addr mutex */ |
879 | |
880 if (ntimer == 0) { | |
881 timer = atimer; | |
882 | |
883 } else if (atimer == 0) { | |
884 timer = ntimer; | |
885 | |
886 } else { | |
887 timer = (atimer < ntimer) ? atimer : ntimer; | |
888 } | |
889 | |
890 if (timer) { | |
891 ngx_add_timer(r->event, (ngx_msec_t) (timer * 1000)); | |
892 } | |
893 } | |
894 | |
895 | |
896 static time_t | |
897 ngx_resolver_resend(ngx_resolver_t *r, ngx_rbtree_t *tree, ngx_queue_t *queue) | |
898 { | |
899 time_t now; | |
900 ngx_queue_t *q; | |
901 ngx_resolver_node_t *rn; | |
902 | |
903 now = ngx_time(); | |
904 | |
905 for ( ;; ) { | |
906 if (ngx_queue_empty(queue)) { | |
907 return 0; | |
908 } | |
909 | |
910 q = ngx_queue_last(queue); | |
911 | |
912 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); | |
913 | |
914 if (now < rn->expire) { | |
915 return rn->expire - now; | |
916 } | |
917 | |
1774 | 918 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, |
919 "resolver resend \"%*s\" %p", | |
920 (size_t) rn->nlen, rn->name, rn->waiting); | |
1649 | 921 |
922 ngx_queue_remove(q); | |
923 | |
924 if (rn->waiting) { | |
925 | |
926 if (ngx_resolver_send_query(r, rn) == NGX_OK) { | |
927 | |
928 rn->expire = now + r->resend_timeout; | |
929 | |
930 ngx_queue_insert_head(queue, &rn->queue); | |
931 } | |
1879
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932 |
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933 continue; |
1649 | 934 } |
935 | |
936 ngx_rbtree_delete(tree, &rn->node); | |
937 | |
938 ngx_resolver_free_node(r, rn); | |
939 } | |
940 } | |
941 | |
942 | |
943 static void | |
944 ngx_resolver_read_response(ngx_event_t *rev) | |
945 { | |
946 ssize_t n; | |
947 ngx_connection_t *c; | |
948 u_char buf[NGX_RESOLVER_UDP_SIZE]; | |
949 | |
950 c = rev->data; | |
951 | |
952 do { | |
1689 | 953 n = ngx_udp_recv(c, buf, NGX_RESOLVER_UDP_SIZE); |
954 | |
955 if (n < 0) { | |
1649 | 956 return; |
957 } | |
958 | |
959 ngx_resolver_process_response(c->data, buf, n); | |
960 | |
961 } while (rev->ready); | |
962 } | |
963 | |
964 | |
965 static void | |
966 ngx_resolver_process_response(ngx_resolver_t *r, u_char *buf, size_t n) | |
967 { | |
968 char *err; | |
969 size_t len; | |
2282
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970 ngx_uint_t i, times, ident, qident, flags, code, nqs, nan, |
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diff
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971 qtype, qclass; |
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diff
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972 ngx_queue_t *q; |
1649 | 973 ngx_resolver_qs_t *qs; |
2282
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diff
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974 ngx_resolver_node_t *rn; |
1649 | 975 ngx_resolver_query_t *query; |
976 | |
2281
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parents:
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diff
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|
977 if ((size_t) n < sizeof(ngx_resolver_query_t)) { |
1649 | 978 goto short_response; |
979 } | |
980 | |
981 query = (ngx_resolver_query_t *) buf; | |
982 | |
983 ident = (query->ident_hi << 8) + query->ident_lo; | |
984 flags = (query->flags_hi << 8) + query->flags_lo; | |
985 nqs = (query->nqs_hi << 8) + query->nqs_lo; | |
986 nan = (query->nan_hi << 8) + query->nan_lo; | |
987 | |
988 ngx_log_debug6(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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989 "resolver DNS response %ui fl:%04Xui %ui/%ui/%ui/%ui", |
1649 | 990 ident, flags, nqs, nan, |
991 (query->nns_hi << 8) + query->nns_lo, | |
992 (query->nar_hi << 8) + query->nar_lo); | |
993 | |
994 if (!(flags & 0x8000)) { | |
995 ngx_log_error(r->log_level, r->log, 0, | |
1967
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996 "invalid DNS response %ui fl:%04Xui", ident, flags); |
1649 | 997 return; |
998 } | |
999 | |
1000 code = flags & 0x7f; | |
1001 | |
2282
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1002 if (code == NGX_RESOLVE_FORMERR) { |
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|
1003 |
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1004 times = 0; |
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diff
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1005 |
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|
1006 for (q = ngx_queue_head(&r->name_resend_queue); |
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1007 q != ngx_queue_sentinel(&r->name_resend_queue) || times++ < 100; |
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1008 q = ngx_queue_next(q)) |
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1009 { |
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|
1010 rn = ngx_queue_data(q, ngx_resolver_node_t, queue); |
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1011 qident = (rn->query[0] << 8) + rn->query[1]; |
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1012 |
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diff
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1013 if (qident == ident) { |
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diff
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1014 ngx_log_error(r->log_level, r->log, 0, |
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1015 "DNS error (%ui: %s), query id:%ui, name:\"%*s\"", |
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1016 code, ngx_resolver_strerror(code), ident, |
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1017 rn->nlen, rn->name); |
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1018 return; |
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1019 } |
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1020 } |
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1021 |
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|
1022 goto dns_error; |
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|
1023 } |
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|
1024 |
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1025 if (code > NGX_RESOLVE_REFUSED) { |
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diff
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|
1026 goto dns_error; |
1649 | 1027 } |
1028 | |
1029 if (nqs != 1) { | |
1030 err = "invalid number of questions in DNS response"; | |
1031 goto done; | |
1032 } | |
1033 | |
1034 i = sizeof(ngx_resolver_query_t); | |
1035 | |
1036 while (i < (ngx_uint_t) n) { | |
1037 if (buf[i] == '\0') { | |
1038 goto found; | |
1039 } | |
1040 | |
1041 len = buf[i]; | |
1042 i += 1 + len; | |
1043 } | |
1044 | |
1045 goto short_response; | |
1046 | |
1047 found: | |
1048 | |
1049 if (i++ == 0) { | |
1050 err = "zero-length domain name in DNS response"; | |
1051 goto done; | |
1052 } | |
1053 | |
1054 if (i + sizeof(ngx_resolver_qs_t) + nan * (2 + sizeof(ngx_resolver_an_t)) | |
1055 > (ngx_uint_t) n) | |
1056 { | |
1057 goto short_response; | |
1058 } | |
1059 | |
1060 qs = (ngx_resolver_qs_t *) &buf[i]; | |
1061 | |
1062 qtype = (qs->type_hi << 8) + qs->type_lo; | |
1063 qclass = (qs->class_hi << 8) + qs->class_lo; | |
1064 | |
1065 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1967
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parents:
1966
diff
changeset
|
1066 "resolver DNS response qt:%ui cl:%ui", qtype, qclass); |
1649 | 1067 |
1068 if (qclass != 1) { | |
1069 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1070 "unknown query class %ui in DNS response", qclass); |
1649 | 1071 return; |
1072 } | |
1073 | |
1074 switch (qtype) { | |
1075 | |
1076 case NGX_RESOLVE_A: | |
1077 | |
1078 ngx_resolver_process_a(r, buf, n, ident, code, nan, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1079 i + sizeof(ngx_resolver_qs_t)); |
1649 | 1080 |
1081 break; | |
1082 | |
1083 case NGX_RESOLVE_PTR: | |
1084 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1085 ngx_resolver_process_ptr(r, buf, n, ident, code, nan); |
1649 | 1086 |
1087 break; | |
1088 | |
1089 default: | |
1090 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1091 "unknown query type %ui in DNS response", qtype); |
1649 | 1092 return; |
1093 } | |
1094 | |
1095 return; | |
1096 | |
1097 short_response: | |
1098 | |
1099 err = "short dns response"; | |
1100 | |
1101 done: | |
1102 | |
1103 ngx_log_error(r->log_level, r->log, 0, err); | |
1104 | |
1105 return; | |
2282
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diff
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|
1106 |
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parents:
2281
diff
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|
1107 dns_error: |
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parents:
2281
diff
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|
1108 |
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2281
diff
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|
1109 ngx_log_error(r->log_level, r->log, 0, |
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parents:
2281
diff
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|
1110 "DNS error (%ui: %s), query id:%ui", |
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diff
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|
1111 code, ngx_resolver_strerror(code), ident); |
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diff
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|
1112 return; |
1649 | 1113 } |
1114 | |
1115 | |
1116 static void | |
1117 ngx_resolver_process_a(ngx_resolver_t *r, u_char *buf, size_t last, | |
1118 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan, ngx_uint_t ans) | |
583 | 1119 { |
1649 | 1120 char *err; |
1121 u_char *cname; | |
1122 size_t len; | |
1123 uint32_t hash; | |
1124 in_addr_t addr, *addrs; | |
1125 ngx_str_t name; | |
1126 ngx_uint_t qtype, qident, naddrs, a, i, n, start; | |
1127 ngx_resolver_an_t *an; | |
1128 ngx_resolver_ctx_t *ctx, *next; | |
1129 ngx_resolver_node_t *rn; | |
1130 | |
1131 if (ngx_resolver_copy(r, &name, buf, &buf[12], &buf[last]) != NGX_OK) { | |
1132 return; | |
1133 } | |
1134 | |
1135 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver qs:%V", &name); | |
1136 | |
1137 hash = ngx_crc32_short(name.data, name.len); | |
1138 | |
1139 /* lock name mutex */ | |
1140 | |
1141 rn = ngx_resolver_lookup_name(r, &name, hash); | |
1142 | |
1143 if (rn == NULL || rn->query == NULL) { | |
1144 ngx_log_error(r->log_level, r->log, 0, | |
1145 "unexpected response for %V", &name); | |
1146 goto failed; | |
1147 } | |
1148 | |
1149 qident = (rn->query[0] << 8) + rn->query[1]; | |
1150 | |
1151 if (ident != qident) { | |
1152 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1153 "wrong ident %ui response for %V, expect %ui", |
1649 | 1154 ident, &name, qident); |
1155 goto failed; | |
1156 } | |
1157 | |
3139 | 1158 ngx_resolver_free(r, name.data); |
1159 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1160 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
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parents:
1741
diff
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|
1161 code = 3; /* NXDOMAIN */ |
268b81386fe4
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parents:
1741
diff
changeset
|
1162 } |
268b81386fe4
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diff
changeset
|
1163 |
1649 | 1164 if (code) { |
1165 next = rn->waiting; | |
1166 rn->waiting = NULL; | |
1167 | |
1168 ngx_queue_remove(&rn->queue); | |
1169 | |
1170 ngx_rbtree_delete(&r->name_rbtree, &rn->node); | |
1171 | |
1172 ngx_resolver_free_node(r, rn); | |
1173 | |
1174 /* unlock name mutex */ | |
1175 | |
1176 while (next) { | |
1177 ctx = next; | |
1178 ctx->state = code; | |
1179 next = ctx->next; | |
1180 | |
1181 ctx->handler(ctx); | |
1182 } | |
1183 | |
1184 return; | |
1185 } | |
1186 | |
1187 i = ans; | |
1188 naddrs = 0; | |
1189 addr = 0; | |
1190 addrs = NULL; | |
1191 cname = NULL; | |
1192 qtype = 0; | |
1193 | |
1194 for (a = 0; a < nan; a++) { | |
1195 | |
1196 start = i; | |
1197 | |
1198 while (i < last) { | |
1199 | |
1200 if (buf[i] & 0xc0) { | |
1201 i += 2; | |
1202 goto found; | |
1203 } | |
1204 | |
1205 if (buf[i] == 0) { | |
1206 i++; | |
1207 goto test_length; | |
1208 } | |
1209 | |
1210 i += 1 + buf[i]; | |
1211 } | |
1212 | |
1213 goto short_response; | |
1214 | |
1215 test_length: | |
1216 | |
1217 if (i - start < 2) { | |
1218 err = "invalid name in dns response"; | |
1219 goto invalid; | |
1220 } | |
1221 | |
1222 found: | |
1223 | |
1224 if (i + sizeof(ngx_resolver_an_t) >= last) { | |
1225 goto short_response; | |
1226 } | |
1227 | |
1228 an = (ngx_resolver_an_t *) &buf[i]; | |
1229 | |
1230 qtype = (an->type_hi << 8) + an->type_lo; | |
1231 len = (an->len_hi << 8) + an->len_lo; | |
1232 | |
1233 if (qtype == NGX_RESOLVE_A) { | |
1234 | |
1235 i += sizeof(ngx_resolver_an_t); | |
1236 | |
1237 if (i + len > last) { | |
1238 goto short_response; | |
1239 } | |
1240 | |
1241 addr = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1242 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1243 | |
1244 naddrs++; | |
1245 | |
1246 i += len; | |
1247 | |
1248 } else if (qtype == NGX_RESOLVE_CNAME) { | |
1249 cname = &buf[i] + sizeof(ngx_resolver_an_t); | |
1250 i += sizeof(ngx_resolver_an_t) + len; | |
1965 | 1251 |
1252 } else if (qtype == NGX_RESOLVE_DNAME) { | |
1253 i += sizeof(ngx_resolver_an_t) + len; | |
1966 | 1254 |
1255 } else { | |
1256 ngx_log_error(r->log_level, r->log, 0, | |
1257 "unexpected qtype %ui", qtype); | |
1649 | 1258 } |
1259 } | |
1260 | |
1261 ngx_log_debug2(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1262 "resolver naddrs:%ui cname:%p", naddrs, cname); | |
1263 | |
1264 if (naddrs) { | |
1265 | |
1266 if (naddrs == 1) { | |
1267 rn->u.addr = addr; | |
1268 | |
1269 } else { | |
1270 | |
1271 addrs = ngx_resolver_alloc(r, naddrs * sizeof(in_addr_t)); | |
1272 if (addrs == NULL) { | |
1273 return; | |
1274 } | |
1275 | |
1276 n = 0; | |
1277 i = ans; | |
1278 | |
1279 for (a = 0; a < nan; a++) { | |
1280 | |
1281 for ( ;; ) { | |
1282 | |
1283 if (buf[i] & 0xc0) { | |
1284 i += 2; | |
1285 goto ok; | |
1286 } | |
1287 | |
1288 if (buf[i] == 0) { | |
1289 i++; | |
1290 goto ok; | |
1291 } | |
1292 | |
1293 i += 1 + buf[i]; | |
1294 } | |
1295 | |
1296 ok: | |
1297 | |
1298 an = (ngx_resolver_an_t *) &buf[i]; | |
1299 | |
1300 qtype = (an->type_hi << 8) + an->type_lo; | |
1301 len = (an->len_hi << 8) + an->len_lo; | |
1302 | |
1303 i += sizeof(ngx_resolver_an_t); | |
1304 | |
1305 if (qtype == NGX_RESOLVE_A) { | |
1306 | |
1307 addrs[n++] = htonl((buf[i] << 24) + (buf[i + 1] << 16) | |
1308 + (buf[i + 2] << 8) + (buf[i + 3])); | |
1309 | |
1310 if (n == naddrs) { | |
1311 break; | |
1312 } | |
1313 } | |
1314 | |
1315 i += len; | |
1316 } | |
1317 | |
1318 rn->u.addrs = addrs; | |
1319 | |
1320 addrs = ngx_resolver_dup(r, rn->u.addrs, | |
1321 naddrs * sizeof(in_addr_t)); | |
1322 if (addrs == NULL) { | |
1323 return; | |
1324 } | |
1325 } | |
1326 | |
1327 rn->naddrs = (u_short) naddrs; | |
1328 | |
1329 ngx_queue_remove(&rn->queue); | |
1330 | |
1331 rn->valid = ngx_time() + r->valid; | |
1332 rn->expire = ngx_time() + r->expire; | |
1333 | |
1334 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1335 | |
1336 next = rn->waiting; | |
1337 rn->waiting = NULL; | |
1338 | |
1339 /* unlock name mutex */ | |
1340 | |
1341 while (next) { | |
1342 ctx = next; | |
1343 ctx->state = NGX_OK; | |
1344 ctx->naddrs = naddrs; | |
1345 ctx->addrs = (naddrs == 1) ? &ctx->addr : addrs; | |
1346 ctx->addr = addr; | |
1347 next = ctx->next; | |
1348 | |
1349 ctx->handler(ctx); | |
1350 } | |
1351 | |
2483
29494780d978
free addrs only it has been allocated before: non single address
Igor Sysoev <igor@sysoev.ru>
parents:
2482
diff
changeset
|
1352 if (naddrs > 1) { |
1649 | 1353 ngx_resolver_free(r, addrs); |
1354 } | |
1355 | |
1356 return; | |
1357 | |
1358 } else if (cname) { | |
1359 | |
1360 /* CNAME only */ | |
1361 | |
1362 if (ngx_resolver_copy(r, &name, buf, cname, &buf[last]) != NGX_OK) { | |
1363 return; | |
1364 } | |
1365 | |
1366 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, | |
1367 "resolver cname:\"%V\"", &name); | |
1368 | |
1741
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1369 ngx_queue_remove(&rn->queue); |
0829024c924d
fix segfault if response will have CNAME only
Igor Sysoev <igor@sysoev.ru>
parents:
1689
diff
changeset
|
1370 |
1649 | 1371 rn->cnlen = (u_short) name.len; |
1372 rn->u.cname = name.data; | |
1373 rn->valid = ngx_time() + r->valid; | |
1374 rn->expire = ngx_time() + r->expire; | |
1375 | |
1376 ngx_queue_insert_head(&r->name_expire_queue, &rn->queue); | |
1377 | |
1378 ctx = rn->waiting; | |
1379 rn->waiting = NULL; | |
1380 | |
1381 if (ctx) { | |
1382 ctx->name = name; | |
1383 | |
1384 (void) ngx_resolve_name_locked(r, ctx); | |
1385 } | |
1386 | |
1387 return; | |
1388 } | |
1389 | |
1390 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1391 "no A or CNAME types in DNS responses, unknown query type: %ui", |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1392 qtype); |
1649 | 1393 return; |
1394 | |
1395 short_response: | |
1396 | |
1397 err = "short dns response"; | |
1398 | |
1399 invalid: | |
1400 | |
1401 /* unlock name mutex */ | |
1402 | |
1403 ngx_log_error(r->log_level, r->log, 0, err); | |
1404 | |
1405 return; | |
1406 | |
1407 failed: | |
1408 | |
1409 /* unlock name mutex */ | |
1410 | |
3139 | 1411 ngx_resolver_free(r, name.data); |
1412 | |
1649 | 1413 return; |
1414 } | |
1415 | |
1416 | |
1417 static void | |
1418 ngx_resolver_process_ptr(ngx_resolver_t *r, u_char *buf, size_t n, | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1419 ngx_uint_t ident, ngx_uint_t code, ngx_uint_t nan) |
1649 | 1420 { |
1421 char *err; | |
1422 size_t len; | |
1423 in_addr_t addr; | |
1424 ngx_int_t digit; | |
1425 ngx_str_t name; | |
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1426 ngx_uint_t i, mask, qident; |
1649 | 1427 ngx_resolver_an_t *an; |
1428 ngx_resolver_ctx_t *ctx, *next; | |
1429 ngx_resolver_node_t *rn; | |
1430 | |
1431 if (ngx_resolver_copy(r, NULL, buf, &buf[12], &buf[n]) != NGX_OK) { | |
1432 goto invalid_in_addr_arpa; | |
1433 } | |
1434 | |
1435 addr = 0; | |
1436 i = 12; | |
1437 | |
1438 for (mask = 0; mask < 32; mask += 8) { | |
1439 len = buf[i++]; | |
1440 | |
1441 digit = ngx_atoi(&buf[i], len); | |
1442 if (digit == NGX_ERROR || digit > 255) { | |
1443 goto invalid_in_addr_arpa; | |
1444 } | |
1445 | |
1446 addr += digit << mask; | |
1447 i += len; | |
1448 } | |
1449 | |
1450 if (ngx_strcmp(&buf[i], "\7in-addr\4arpa") != 0) { | |
1451 goto invalid_in_addr_arpa; | |
1452 } | |
1453 | |
1454 /* lock addr mutex */ | |
1455 | |
1456 rn = ngx_resolver_lookup_addr(r, addr); | |
1457 | |
1458 if (rn == NULL || rn->query == NULL) { | |
1459 ngx_log_error(r->log_level, r->log, 0, | |
1460 "unexpected response for %ud.%ud.%ud.%ud", | |
1461 (addr >> 24) & 0xff, (addr >> 16) & 0xff, | |
1462 (addr >> 8) & 0xff, addr & 0xff); | |
1463 goto failed; | |
1464 } | |
1465 | |
1466 qident = (rn->query[0] << 8) + rn->query[1]; | |
1467 | |
1468 if (ident != qident) { | |
1469 ngx_log_error(r->log_level, r->log, 0, | |
1967
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1470 "wrong ident %ui response for %ud.%ud.%ud.%ud, expect %ui", |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1471 ident, (addr >> 24) & 0xff, (addr >> 16) & 0xff, |
4a4b15c9c474
use correct ngx_sprintf() formats
Igor Sysoev <igor@sysoev.ru>
parents:
1966
diff
changeset
|
1472 (addr >> 8) & 0xff, addr & 0xff, qident); |
1649 | 1473 goto failed; |
1474 } | |
1475 | |
1742
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1476 if (code == 0 && nan == 0) { |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1477 code = 3; /* NXDOMAIN */ |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1478 } |
268b81386fe4
no answers in DNS response should be NXDOMAIN
Igor Sysoev <igor@sysoev.ru>
parents:
1741
diff
changeset
|
1479 |
1649 | 1480 if (code) { |
1481 next = rn->waiting; | |
1482 rn->waiting = NULL; | |
1483 | |
1484 ngx_queue_remove(&rn->queue); | |
1485 | |
1486 ngx_rbtree_delete(&r->addr_rbtree, &rn->node); | |
1487 | |
1488 ngx_resolver_free_node(r, rn); | |
1489 | |
1490 /* unlock addr mutex */ | |
1491 | |
1492 while (next) { | |
1493 ctx = next; | |
1494 ctx->state = code; | |
1495 next = ctx->next; | |
1496 | |
1497 ctx->handler(ctx); | |
1498 } | |
1499 | |
1500 return; | |
1501 } | |
1502 | |
1503 i += sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t); | |
1504 | |
1505 if (i + 2 + sizeof(ngx_resolver_an_t) > (ngx_uint_t) n) { | |
1506 goto short_response; | |
1507 } | |
1508 | |
1509 /* compression pointer to "XX.XX.XX.XX.in-addr.arpa */ | |
1510 | |
1511 if (buf[i] != 0xc0 || buf[i + 1] != 0x0c) { | |
1512 err = "invalid in-addr.arpa name in DNS response"; | |
1513 goto invalid; | |
1514 } | |
1515 | |
1516 an = (ngx_resolver_an_t *) &buf[i + 2]; | |
1517 | |
1518 len = (an->len_hi << 8) + an->len_lo; | |
1519 | |
1520 ngx_log_debug3(NGX_LOG_DEBUG_CORE, r->log, 0, | |
3902
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1521 "resolver qt:%ui cl:%ui len:%uz", |
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1522 (an->type_hi << 8) + an->type_lo, |
159b58f9c0bd
fix building by gcc 4.6 without --with-debug
Igor Sysoev <igor@sysoev.ru>
parents:
3763
diff
changeset
|
1523 (an->class_hi << 8) + an->class_lo, len); |
1649 | 1524 |
1525 i += 2 + sizeof(ngx_resolver_an_t); | |
1526 | |
1527 if (i + len > (ngx_uint_t) n) { | |
1528 goto short_response; | |
1529 } | |
1530 | |
1531 if (ngx_resolver_copy(r, &name, buf, &buf[i], &buf[n]) != NGX_OK) { | |
1532 return; | |
1533 } | |
1534 | |
1535 ngx_log_debug1(NGX_LOG_DEBUG_CORE, r->log, 0, "resolver an:%V", &name); | |
1536 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1537 if (name.len != (size_t) rn->nlen |
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1538 || ngx_strncmp(name.data, rn->name, name.len) != 0) |
1649 | 1539 { |
2482
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1540 if (rn->nlen) { |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1541 ngx_resolver_free(r, rn->name); |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1542 } |
30ec8c5ac75b
fix reverse resolving cache: it stored zero length names
Igor Sysoev <igor@sysoev.ru>
parents:
2314
diff
changeset
|
1543 |
2490
1c87647b7ca5
fix building by msvc, introduced in r2487
Igor Sysoev <igor@sysoev.ru>
parents:
2487
diff
changeset
|
1544 rn->nlen = (u_short) name.len; |
1649 | 1545 rn->name = name.data; |
1546 | |
2486
8de5dc3e7001
use length of uncompressed name
Igor Sysoev <igor@sysoev.ru>
parents:
2484
diff
changeset
|
1547 name.data = ngx_resolver_dup(r, rn->name, name.len); |
1649 | 1548 if (name.data == NULL) { |
1549 goto failed; | |
1550 } | |
1551 } | |
1552 | |
1553 ngx_queue_remove(&rn->queue); | |
1554 | |
1555 rn->valid = ngx_time() + r->valid; | |
1556 rn->expire = ngx_time() + r->expire; | |
1557 | |
1558 ngx_queue_insert_head(&r->addr_expire_queue, &rn->queue); | |
1559 | |
1560 next = rn->waiting; | |
1561 rn->waiting = NULL; | |
1562 | |
1563 /* unlock addr mutex */ | |
1564 | |
1565 while (next) { | |
1566 ctx = next; | |
1567 ctx->state = NGX_OK; | |
1568 ctx->name = name; | |
1569 next = ctx->next; | |
1570 | |
1571 ctx->handler(ctx); | |
1572 } | |
1573 | |
1574 ngx_resolver_free(r, name.data); | |
1575 | |
1576 return; | |
1577 | |
1578 invalid_in_addr_arpa: | |
1579 | |
1580 ngx_log_error(r->log_level, r->log, 0, | |
1581 "invalid in-addr.arpa name in DNS response"); | |
1582 return; | |
1583 | |
1584 short_response: | |
1585 | |
1586 err = "short DNS response"; | |
1587 | |
1588 invalid: | |
1589 | |
1590 /* unlock addr mutex */ | |
1591 | |
1592 ngx_log_error(r->log_level, r->log, 0, err); | |
1593 | |
1594 return; | |
1595 | |
1596 failed: | |
1597 | |
1598 /* unlock addr mutex */ | |
1599 | |
1600 return; | |
1601 } | |
1602 | |
1603 | |
1604 static ngx_resolver_node_t * | |
1605 ngx_resolver_lookup_name(ngx_resolver_t *r, ngx_str_t *name, uint32_t hash) | |
1606 { | |
1607 ngx_int_t rc; | |
1608 ngx_rbtree_node_t *node, *sentinel; | |
1609 ngx_resolver_node_t *rn; | |
1610 | |
1611 node = r->name_rbtree.root; | |
1612 sentinel = r->name_rbtree.sentinel; | |
1613 | |
1614 while (node != sentinel) { | |
1615 | |
1616 if (hash < node->key) { | |
1617 node = node->left; | |
1618 continue; | |
1619 } | |
1620 | |
1621 if (hash > node->key) { | |
1622 node = node->right; | |
1623 continue; | |
1624 } | |
1625 | |
1626 /* hash == node->key */ | |
1627 | |
1628 do { | |
1629 rn = (ngx_resolver_node_t *) node; | |
1630 | |
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1631 rc = ngx_memn2cmp(name->data, rn->name, name->len, rn->nlen); |
1649 | 1632 |
1633 if (rc == 0) { | |
1634 return rn; | |
1635 } | |
1636 | |
1637 node = (rc < 0) ? node->left : node->right; | |
1638 | |
1639 } while (node != sentinel && hash == node->key); | |
1640 | |
1641 break; | |
1642 } | |
1643 | |
1644 /* not found */ | |
1645 | |
1646 return NULL; | |
1647 } | |
1648 | |
1649 | |
1650 static ngx_resolver_node_t * | |
1651 ngx_resolver_lookup_addr(ngx_resolver_t *r, in_addr_t addr) | |
1652 { | |
1653 ngx_rbtree_node_t *node, *sentinel; | |
1654 | |
1655 node = r->addr_rbtree.root; | |
1656 sentinel = r->addr_rbtree.sentinel; | |
1657 | |
1658 while (node != sentinel) { | |
1659 | |
1660 if (addr < node->key) { | |
1661 node = node->left; | |
1662 continue; | |
1663 } | |
1664 | |
1665 if (addr > node->key) { | |
1666 node = node->right; | |
1667 continue; | |
1668 } | |
1669 | |
1670 /* addr == node->key */ | |
1671 | |
1672 return (ngx_resolver_node_t *) node; | |
1673 } | |
1674 | |
1675 /* not found */ | |
1676 | |
1677 return NULL; | |
1678 } | |
1679 | |
1680 | |
1681 static void | |
1682 ngx_resolver_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1683 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) | |
1684 { | |
1685 ngx_rbtree_node_t **p; | |
1686 ngx_resolver_node_t *rn, *rn_temp; | |
1687 | |
1688 for ( ;; ) { | |
1689 | |
1690 if (node->key < temp->key) { | |
1691 | |
1692 p = &temp->left; | |
1693 | |
1694 } else if (node->key > temp->key) { | |
1695 | |
1696 p = &temp->right; | |
1697 | |
1698 } else { /* node->key == temp->key */ | |
1699 | |
1700 rn = (ngx_resolver_node_t *) node; | |
1701 rn_temp = (ngx_resolver_node_t *) temp; | |
1702 | |
3143
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1703 p = (ngx_memn2cmp(rn->name, rn_temp->name, rn->nlen, rn_temp->nlen) |
ab6258e18099
fix resolver cache rbtree comparison
Igor Sysoev <igor@sysoev.ru>
parents:
3139
diff
changeset
|
1704 < 0) ? &temp->left : &temp->right; |
1649 | 1705 } |
1706 | |
1707 if (*p == sentinel) { | |
1708 break; | |
1709 } | |
1710 | |
1711 temp = *p; | |
1712 } | |
1713 | |
1714 *p = node; | |
1715 node->parent = temp; | |
1716 node->left = sentinel; | |
1717 node->right = sentinel; | |
1718 ngx_rbt_red(node); | |
1719 } | |
1720 | |
1721 | |
1722 static ngx_int_t | |
1723 ngx_resolver_create_name_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1724 { | |
1725 u_char *p, *s; | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1726 size_t len, nlen; |
1649 | 1727 ngx_uint_t ident; |
1728 ngx_resolver_qs_t *qs; | |
1729 ngx_resolver_query_t *query; | |
1730 | |
3306
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1731 nlen = ctx->name.len ? (1 + ctx->name.len + 1) : 1; |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1732 |
61bdaac6c668
fix resolving an empty name (".")
Igor Sysoev <igor@sysoev.ru>
parents:
3299
diff
changeset
|
1733 len = sizeof(ngx_resolver_query_t) + nlen + sizeof(ngx_resolver_qs_t); |
1649 | 1734 |
3307
34e99a97fbd6
use ngx_resolver_alloc() instead of ngx_resolver_calloc()
Igor Sysoev <igor@sysoev.ru>
parents:
3306
diff
changeset
|
1735 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1736 if (p == NULL) { |
1737 return NGX_ERROR; | |
1738 } | |
1739 | |
1740 rn->qlen = (u_short) len; | |
1741 rn->query = p; | |
1742 | |
1743 query = (ngx_resolver_query_t *) p; | |
1744 | |
1745 ident = ngx_random(); | |
1746 | |
1747 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ctx->resolver->log, 0, | |
1748 "resolve: \"%V\" %i", &ctx->name, ident & 0xffff); | |
1749 | |
1750 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1751 query->ident_lo = (u_char) (ident & 0xff); | |
1752 | |
1753 /* recursion query */ | |
1754 query->flags_hi = 1; query->flags_lo = 0; | |
1755 | |
1756 /* one question */ | |
1757 query->nqs_hi = 0; query->nqs_lo = 1; | |
1758 query->nan_hi = 0; query->nan_lo = 0; | |
1759 query->nns_hi = 0; query->nns_lo = 0; | |
1760 query->nar_hi = 0; query->nar_lo = 0; | |
1761 | |
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1762 p += sizeof(ngx_resolver_query_t) + nlen; |
1649 | 1763 |
1764 qs = (ngx_resolver_qs_t *) p; | |
1765 | |
1766 /* query type */ | |
1767 qs->type_hi = 0; qs->type_lo = (u_char) ctx->type; | |
1768 | |
1769 /* IP query class */ | |
1770 qs->class_hi = 0; qs->class_lo = 1; | |
1771 | |
1772 /* convert "www.example.com" to "\3www\7example\3com\0" */ | |
1773 | |
1774 len = 0; | |
1775 p--; | |
1776 *p-- = '\0'; | |
1777 | |
1778 for (s = ctx->name.data + ctx->name.len - 1; s >= ctx->name.data; s--) { | |
1779 if (*s != '.') { | |
1780 *p = *s; | |
1781 len++; | |
1782 | |
1783 } else { | |
1961
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1784 if (len == 0) { |
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1785 return NGX_DECLINED; |
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1786 } |
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1787 |
1649 | 1788 *p = (u_char) len; |
1789 len = 0; | |
1790 } | |
1791 | |
1792 p--; | |
1793 } | |
1794 | |
1795 *p = (u_char) len; | |
1796 | |
1797 return NGX_OK; | |
1798 } | |
1799 | |
1800 | |
1801 /* AF_INET only */ | |
1802 | |
1803 static ngx_int_t | |
1804 ngx_resolver_create_addr_query(ngx_resolver_node_t *rn, ngx_resolver_ctx_t *ctx) | |
1805 { | |
1806 u_char *p, *d; | |
1807 size_t len; | |
1808 ngx_int_t n; | |
1809 ngx_uint_t ident; | |
1810 ngx_resolver_query_t *query; | |
1811 | |
1812 len = sizeof(ngx_resolver_query_t) | |
1813 + sizeof(".255.255.255.255.in-addr.arpa.") - 1 | |
1814 + sizeof(ngx_resolver_qs_t); | |
1815 | |
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1816 p = ngx_resolver_alloc(ctx->resolver, len); |
1649 | 1817 if (p == NULL) { |
1818 return NGX_ERROR; | |
1819 } | |
1820 | |
1821 rn->query = p; | |
1822 query = (ngx_resolver_query_t *) p; | |
1823 | |
1824 ident = ngx_random(); | |
1825 | |
1826 query->ident_hi = (u_char) ((ident >> 8) & 0xff); | |
1827 query->ident_lo = (u_char) (ident & 0xff); | |
1828 | |
1829 /* recursion query */ | |
1830 query->flags_hi = 1; query->flags_lo = 0; | |
1831 | |
1832 /* one question */ | |
1833 query->nqs_hi = 0; query->nqs_lo = 1; | |
1834 query->nan_hi = 0; query->nan_lo = 0; | |
1835 query->nns_hi = 0; query->nns_lo = 0; | |
1836 query->nar_hi = 0; query->nar_lo = 0; | |
1837 | |
1838 p += sizeof(ngx_resolver_query_t); | |
1839 | |
3642 | 1840 for (n = 0; n < 32; n += 8) { |
1649 | 1841 d = ngx_sprintf(&p[1], "%ud", (ctx->addr >> n) & 0xff); |
1842 *p = (u_char) (d - &p[1]); | |
1843 p = d; | |
1844 } | |
1845 | |
1846 /* query type "PTR", IP query class */ | |
1847 ngx_memcpy(p, "\7in-addr\4arpa\0\0\14\0\1", 18); | |
1848 | |
1849 rn->qlen = (u_short) | |
1850 (p + sizeof("\7in-addr\4arpa") + sizeof(ngx_resolver_qs_t) | |
1851 - rn->query); | |
1852 | |
1853 return NGX_OK; | |
1854 } | |
1855 | |
1856 | |
1857 static ngx_int_t | |
1858 ngx_resolver_copy(ngx_resolver_t *r, ngx_str_t *name, u_char *buf, u_char *src, | |
1859 u_char *last) | |
1860 { | |
1861 char *err; | |
1862 u_char *p, *dst; | |
1863 ssize_t len; | |
1864 ngx_uint_t i, n; | |
1865 | |
1866 p = src; | |
1867 len = -1; | |
1868 | |
1869 /* | |
1870 * compression pointers allow to create endless loop, so we set limit; | |
1871 * 128 pointers should be enough to store 255-byte name | |
1872 */ | |
1873 | |
1874 for (i = 0; i < 128; i++) { | |
1875 n = *p++; | |
1876 | |
1877 if (n == 0) { | |
1878 goto done; | |
1879 } | |
1880 | |
1881 if (n & 0xc0) { | |
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1882 n = ((n & 0x3f) << 8) + *p; |
1649 | 1883 p = &buf[n]; |
1884 | |
1885 } else { | |
1886 len += 1 + n; | |
1887 p = &p[n]; | |
1888 } | |
1889 | |
1890 if (p >= last) { | |
1891 err = "name is out of response"; | |
1892 goto invalid; | |
1893 } | |
1894 } | |
1895 | |
1896 err = "compression pointers loop"; | |
1897 | |
1898 invalid: | |
1899 | |
1900 ngx_log_error(r->log_level, r->log, 0, err); | |
1901 | |
1902 return NGX_ERROR; | |
1903 | |
1904 done: | |
1905 | |
1906 if (name == NULL) { | |
583 | 1907 return NGX_OK; |
1908 } | |
1909 | |
3298
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1910 if (len == -1) { |
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1911 name->len = 0; |
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1912 name->data = NULL; |
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1913 return NGX_OK; |
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1914 } |
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1915 |
1649 | 1916 dst = ngx_resolver_alloc(r, len); |
1917 if (dst == NULL) { | |
1918 return NGX_ERROR; | |
1919 } | |
1920 | |
1921 name->data = dst; | |
1922 | |
1923 n = *src++; | |
1924 | |
1925 for ( ;; ) { | |
4287 | 1926 if (n & 0xc0) { |
1927 n = ((n & 0x3f) << 8) + *src; | |
1928 src = &buf[n]; | |
1929 | |
1930 n = *src++; | |
1931 | |
1932 } else { | |
1649 | 1933 ngx_memcpy(dst, src, n); |
1934 dst += n; | |
1935 src += n; | |
1936 | |
1937 n = *src++; | |
1938 | |
1939 if (n != 0) { | |
1940 *dst++ = '.'; | |
1941 } | |
1942 } | |
1943 | |
1944 if (n == 0) { | |
1945 name->len = dst - name->data; | |
1946 return NGX_OK; | |
1947 } | |
1948 } | |
1949 } | |
1950 | |
1951 | |
1952 static void | |
1953 ngx_resolver_timeout_handler(ngx_event_t *ev) | |
1954 { | |
1955 ngx_resolver_ctx_t *ctx; | |
1956 | |
1957 ctx = ev->data; | |
1958 | |
1959 ctx->state = NGX_RESOLVE_TIMEDOUT; | |
1960 | |
1961 ctx->handler(ctx); | |
1962 } | |
1963 | |
1964 | |
1965 static void | |
1966 ngx_resolver_free_node(ngx_resolver_t *r, ngx_resolver_node_t *rn) | |
1967 { | |
1968 /* lock alloc mutex */ | |
1969 | |
1970 if (rn->query) { | |
1971 ngx_resolver_free_locked(r, rn->query); | |
1972 } | |
1973 | |
1974 if (rn->name) { | |
1975 ngx_resolver_free_locked(r, rn->name); | |
1976 } | |
1977 | |
1978 if (rn->cnlen) { | |
1979 ngx_resolver_free_locked(r, rn->u.cname); | |
1980 } | |
1981 | |
1982 if (rn->naddrs > 1) { | |
1983 ngx_resolver_free_locked(r, rn->u.addrs); | |
1984 } | |
1985 | |
1986 ngx_resolver_free_locked(r, rn); | |
1987 | |
1988 /* unlock alloc mutex */ | |
1989 } | |
1990 | |
1991 | |
1992 static void * | |
1993 ngx_resolver_alloc(ngx_resolver_t *r, size_t size) | |
1994 { | |
1995 u_char *p; | |
1996 | |
1997 /* lock alloc mutex */ | |
1998 | |
1999 p = ngx_alloc(size, r->log); | |
2000 | |
2001 /* unlock alloc mutex */ | |
2002 | |
2003 return p; | |
2004 } | |
2005 | |
2006 | |
1903 | 2007 static void * |
1649 | 2008 ngx_resolver_calloc(ngx_resolver_t *r, size_t size) |
2009 { | |
2010 u_char *p; | |
2011 | |
2012 p = ngx_resolver_alloc(r, size); | |
2013 | |
2014 if (p) { | |
2015 ngx_memzero(p, size); | |
2016 } | |
2017 | |
2018 return p; | |
2019 } | |
2020 | |
2021 | |
2022 static void | |
2023 ngx_resolver_free(ngx_resolver_t *r, void *p) | |
2024 { | |
2025 /* lock alloc mutex */ | |
2026 | |
2027 ngx_free(p); | |
2028 | |
2029 /* unlock alloc mutex */ | |
2030 } | |
2031 | |
2032 | |
2033 static void | |
2034 ngx_resolver_free_locked(ngx_resolver_t *r, void *p) | |
2035 { | |
2036 ngx_free(p); | |
2037 } | |
2038 | |
2039 | |
2040 static void * | |
2041 ngx_resolver_dup(ngx_resolver_t *r, void *src, size_t size) | |
2042 { | |
2043 void *dst; | |
2044 | |
2045 dst = ngx_resolver_alloc(r, size); | |
2046 | |
2047 if (dst == NULL) { | |
2048 return dst; | |
2049 } | |
2050 | |
2051 ngx_memcpy(dst, src, size); | |
2052 | |
2053 return dst; | |
2054 } | |
2055 | |
2056 | |
2057 char * | |
2058 ngx_resolver_strerror(ngx_int_t err) | |
2059 { | |
2060 static char *errors[] = { | |
2061 "Format error", /* FORMERR */ | |
2062 "Server failure", /* SERVFAIL */ | |
2063 "Host not found", /* NXDOMAIN */ | |
2064 "Unimplemented", /* NOTIMP */ | |
2065 "Operation refused" /* REFUSED */ | |
2066 }; | |
2067 | |
2068 if (err > 0 && err < 6) { | |
2069 return errors[err - 1]; | |
2070 } | |
2071 | |
2072 if (err == NGX_RESOLVE_TIMEDOUT) { | |
2073 return "Operation timed out"; | |
2074 } | |
2075 | |
2076 return "Unknown error"; | |
2077 } | |
2078 | |
2079 | |
3408
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2080 static u_char * |
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2081 ngx_resolver_log_error(ngx_log_t *log, u_char *buf, size_t len) |
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2082 { |
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2083 u_char *p; |
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2084 ngx_udp_connection_t *uc; |
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2085 |
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2086 p = buf; |
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2087 |
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2088 if (log->action) { |
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2089 p = ngx_snprintf(buf, len, " while %s", log->action); |
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2090 len -= p - buf; |
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2091 } |
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2092 |
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2093 uc = log->data; |
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2094 |
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2095 if (uc) { |
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2096 p = ngx_snprintf(p, len, ", resolver: %V", &uc->server); |
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2097 } |
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2098 |
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2099 return p; |
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2100 } |
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2101 |
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2102 |
1649 | 2103 ngx_int_t |
2104 ngx_udp_connect(ngx_udp_connection_t *uc) | |
2105 { | |
2106 int rc; | |
2107 ngx_int_t event; | |
2108 ngx_event_t *rev, *wev; | |
2109 ngx_socket_t s; | |
2110 ngx_connection_t *c; | |
2111 | |
583 | 2112 s = ngx_socket(AF_INET, SOCK_DGRAM, 0); |
2113 | |
3408
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2114 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, &uc->log, 0, "UDP socket %d", s); |
583 | 2115 |
2116 if (s == -1) { | |
3408
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2117 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2118 ngx_socket_n " failed"); |
2119 return NGX_ERROR; | |
2120 } | |
2121 | |
3408
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2122 c = ngx_get_connection(s, &uc->log); |
583 | 2123 |
2124 if (c == NULL) { | |
2125 if (ngx_close_socket(s) == -1) { | |
3408
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2126 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
583 | 2127 ngx_close_socket_n "failed"); |
2128 } | |
2129 | |
2130 return NGX_ERROR; | |
2131 } | |
2132 | |
1649 | 2133 if (ngx_nonblocking(s) == -1) { |
3408
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2134 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2135 ngx_nonblocking_n " failed"); |
2136 | |
2137 ngx_free_connection(c); | |
2138 | |
2139 if (ngx_close_socket(s) == -1) { | |
3408
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2140 ngx_log_error(NGX_LOG_ALERT, &uc->log, ngx_socket_errno, |
1649 | 2141 ngx_close_socket_n " failed"); |
2142 } | |
2143 | |
2144 return NGX_ERROR; | |
2145 } | |
2146 | |
583 | 2147 rev = c->read; |
2148 wev = c->write; | |
2149 | |
3408
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2150 rev->log = &uc->log; |
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2151 wev->log = &uc->log; |
1649 | 2152 |
2153 uc->connection = c; | |
583 | 2154 |
2155 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); | |
2156 | |
2157 #if (NGX_THREADS) | |
1649 | 2158 |
2159 /* TODO: lock event when call completion handler */ | |
2160 | |
2161 rev->lock = &c->lock; | |
2162 wev->lock = &c->lock; | |
583 | 2163 rev->own_lock = &c->lock; |
2164 wev->own_lock = &c->lock; | |
1649 | 2165 |
583 | 2166 #endif |
2167 | |
3408
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2168 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, &uc->log, 0, |
1649 | 2169 "connect to %V, fd:%d #%d", &uc->server, s, c->number); |
2170 | |
2171 rc = connect(s, uc->sockaddr, uc->socklen); | |
2172 | |
2173 /* TODO: aio, iocp */ | |
583 | 2174 |
2175 if (rc == -1) { | |
3408
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2176 ngx_log_error(NGX_LOG_CRIT, &uc->log, ngx_socket_errno, |
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2177 "connect() failed"); |
583 | 2178 |
2179 return NGX_ERROR; | |
2180 } | |
2181 | |
1649 | 2182 /* UDP sockets are always ready to write */ |
2183 wev->ready = 1; | |
2184 | |
2185 if (ngx_add_event) { | |
2186 | |
2187 event = (ngx_event_flags & NGX_USE_CLEAR_EVENT) ? | |
2188 /* kqueue, epoll */ NGX_CLEAR_EVENT: | |
2189 /* select, poll, /dev/poll */ NGX_LEVEL_EVENT; | |
2190 /* eventport event type has no meaning: oneshot only */ | |
2191 | |
2192 if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { | |
2193 return NGX_ERROR; | |
2194 } | |
2195 | |
2196 } else { | |
2197 /* rtsig */ | |
2198 | |
583 | 2199 if (ngx_add_conn(c) == NGX_ERROR) { |
2200 return NGX_ERROR; | |
2201 } | |
2202 } | |
2203 | |
2204 return NGX_OK; | |
2205 } |